Stud extractor



July 21, 1931. E. M. DOAN STUD EXTRACTOR Filed March 17, 1930 2 Sheets-Sheet l Fae? 2062 1. @W

' A itorney July 21, 1931.

E. M. DOAN 1,815,500

STUD EXTRACTOR Filed March 17, 1930 2 Sheets-Sheet 2 Invenior )4 iiorney Patented July 2 1, 1931 UNITED- STATES PATENT OFFICE EL'MER I. OF SAN DIEGO, CALIFORNIA I STUD EXTRACTOR Application filed March 17, 19:50; Serial No. 435,595;

This invention relates broadly to extracting tools, and has more particular reference to an extracting tool especially adapted for A extracting stud bolts.

The primary object of the present inven-' tion is to provide a. tool of this character which is comparatively simple in construe-- tion, thoroughly reliable, practical and efii- .cient in operation, and whereby the use of which the removal or extraction of a stud bolt may be effected without the crossing or mutilation of the thread of the stud bolts.

Other objects and advantages of the invention will become apparent during a study of the following, taken in connection with the accompanying drawings whereini Figure 1 is a view partly in section and partly in elevation of one form of my im- 4-4 of Figure 1,

Figure 5 is a view similar to Figure 1 of a modified form of the invention,

Figure 6 is an elevational view of the body member and nut forming parts of the said modification,

Figure 7 is a transverse horizontal sectional view taken substantially on the line 77 of Figure 5 Referring more in particular to Figures 1 to 4 inclusive, it will be seen that one form of my invention comprises a shank'member 5 having an upper externally threaded head 6. The lower end portion of the shank 5 is split longitudinally as at 7 to provide a pair of cooperating jaws 88. The outer surfaces of the jaws 8 are designated by the reference character 9, and it will be noted that the outer surfaces of these aws are substantially semi-conical.

At their lower ends, the jaws 8 are provided with an axial bore internally screw threaded as at 10, the threads 10 corresponding to the threads 11 of the stud bolt 12, which stud bolt 12 has one end threadedly engaging a stud receiving plate 13.

The main body member 14 of the tool includes an upper hexagonal part 15 and a lower conical part 16. The main body member 14 is opened at its opposite end and has a longitudinal bore 16 extending therethrough, and at its lower end, the bore 16 is provided with a conical mouth 17.

The conical or flared mouth 17 as shown to advantage in Figure-1 cooperates with the outer surfaces 9 of the jaws 8, and hence the opening and closing of the jaws 8 will be controlled from the body member 14 in an obvious manner.

In order to prevent relative rotative movement of the bodymember 14 and shank 5, there is provided within the conical mouth 17 longitudinally extending groove 18 in P which slidably seat ribs 19 on the backs of the jaws 8.

When the shanks 5 and main body mem ber 14 are in'the position shown in Figure 1', a hexagonal nut 20 is threaded on the end 6 of the shank, and by rotating the nut 20 in the proper direction, it will be seen that the body member 14 will be urged downwardly thus forcing-the jaws ,S-inwardly into grip-- ping engagement with the stud 11.

The jaws 8 having thus been moved into gripping engagement with the stud 11 by turning the body member 14 through the medium of a wrench or any other suitable implement gripping the upper part 15 of the body member, it is apparent that the stud 11 may be suitably rotated to unscrew the stud 11 thereby effecting the removal thereof from v the plate 13.

In that embodiment of the invention shown in Figures 5 to 7 inclusive, it will be seen that conical part 16'. The upper part 15 is provided with internal left hand threads corre sponding to the threads on the upper end portion 6 of the shank The body member 14 is of course open at its ends, and provided in the upper part 15 is a longitudinal bore internally threaded as before mentioned for threaded engagement with the upper end portion 6 of the shank 5, the bore being designated by the reference character 16, and the lower end or mouth 17 of the bore is made conically flaring for cooperation with the outer surfaces 9 of the jaws 8'.

In this embodiment of the invention, it will be seen that when the shank 5', and the body member 14 are disposed in that position shown in Figure 5, the shank 5 may be suitably rotated through the medium of a wrench or other suitable tool gripping the squared upper terminal 21of the shank 5' so that the jaws 8 may be threadedly engaged with the threads of the stud 12.

;When the shank 5 has been turned sufficiently for gripping the stud bolt 12, the shank 5 is then held stationary, the wrench still engaging the squared end 21 of the shank, and the main body member 14; may be then rotated in a suitable direction through the medium of a wrench gripping the upper part 15 of the main body member 14 thus urging the same downwardly ,of the shank 6 resulting as is obvious, in the jaws 8 being moved inwardly toward one another in firm gripping engagement with the stud 12.

A block nut 20 is threaded on the upper threaded end 6 of the tank 5, said nut 20 being provided with internal left hand threads for engagement with the threads of said shank and upon rotation thereof it is evident that the nuts will engage the upper end of the body member 14.

The main body member 14' and shank 5' now being in-thorough gripping engagement with one another, it is obvious that upon further rotating the main body member 14', the shank 5 will also be rotated thereby effecting a rotation of the stud 12 and consequent removal of the stud.

It is thought that from the foregoing description, taken in conjunction with the accompanying drawings, a clear understanding of the operation, utility and advantages of an invention of this character may be had by those skilled in the art without a more detailed description. 1

Having thus described my invention, what I claim as new is:

1. In a stud extractor of the class described, a shank having an upper threaded portion of uniform diameter, and a lower conical portion, said lower portion being split longitudinally to provide a pair of cooperating gripping jaws having outer semi-conical surfaces, a body member having a bore extending therethrough for accommodating said shank, said body member provided with an upper portion having external wrench gripping faces, and a lower conical portion, the bore of said body member at said lower conical portion provided with a conical mouth for accommodating the conical lower portion of said shank, and a nut threadedly engaging the threaded upper portion of said shank and adapted to engage the upper end of said body member.

2. In a stud extractor of the class described, a shank having an upper threaded portion of uniform diameter, and a lower conical portion, said lower portion being split longitudinally to provide a pair of cooperating gripping aws having outer semi-conical w surfaces, a body member having a bore extending therethrough for accommodating said shank, said body member provided with an upper portion having external wrench gripping faces, and a lower conical portion, the bore of said body member at said lower conical portion provided with a conical mouth for accommodating the conical lower portion of said shank, and a nut threadedly engaging the threaded upper portion of said shank and adapted to engage the upper end of said body member, and said upper portion of said body provided with internal threads for threaded engagement with the threaded portion of said shank.

In testimony whereof I affix my signature.

ELMER M. DOAN. 

